1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
#!/usr/bin/env ruby
require File.expand_path(File.join(File.dirname(__FILE__), "test_helper"))
describe BinData::ResumeByteAlignment do
class ResumeAlignmentRecord < BinData::Record
bit4 :a
resume_byte_alignment
bit4 :b
end
let(:obj) { ResumeAlignmentRecord.new }
it "resets read alignment" do
obj.read "\x12\x34"
_(obj.a).must_equal 1
_(obj.b).must_equal 3
end
it "resets write alignment" do
obj.assign(a: 2, b: 7)
_(obj.to_binary_s).must_equal_binary "\x20\x70"
end
end
describe BinData::BitAligned do
it "does not apply to BinData::Primitives" do
_ {
class BitAlignedPrimitive < BinData::Primitive
bit_aligned
end
}.must_raise RuntimeError
end
class BitString < BinData::String
bit_aligned
end
class BitAlignedRecord < BinData::Record
bit4 :preamble
bit_string :str, length: 2
bit4 :afterward
end
let(:obj) { BitAlignedRecord.new }
it "#num_bytes as expected" do
_(obj.num_bytes).must_equal 3
end
it "has expected abs_offset" do
_(obj.str.abs_offset).must_equal 0
end
it "reads as expected" do
obj.read("\x56\x36\x42")
_(obj.snapshot).must_equal({preamble: 5, str: "cd", afterward: 2})
end
it "writes as expected" do
obj.assign(preamble: 5, str: "ab", afterward: 1)
_(obj.to_binary_s).must_equal_binary "\x56\x16\x21"
end
end
|
